Just how common is it to have multiple mood and/or personality disorders?

Sometimes when I actually take a moment to reflect on all of my comorbid diagnoses, I realize that simple fact alone makes it seem like a much larger mountain to climb than it may be. Not to downplay the severity that mental illness can get to, including my own, but when I really lay it out it just seems much worse to have it broken up into multiple “disorders.” I find myself frustrated that there is just no way to simplify it with one diagnosis.
I think that I once read that 50% of people with major depressive disorder will also have an anxiety disorder, but what about beyond that? How common is it to have 3, 4, or maybe more?